Yogurt has an approximate pH of 5 and vinegar has an approximate pH of 3. How many times more acidic is vinegar compared to yogurt in terms of concentration?

The vinegar is highly acidic by 100 times than yogurt.

Explanation:

∵ pH = - log[H⁺]

The concentration of H⁺ in yogurt:

∵ pH = - log[H⁺]

∴ 5 = - log[H⁺]

∴ [H⁺] = 1.0 x 10⁻⁵ M.

The concentration of H⁺ in vinegar:

∵ pH = - log[H⁺]

∴ 3 = - log[H⁺]

∴ [H⁺] = 1.0 x 10⁻³ M.

the ratio of H⁺ in vinegar to that in yogurt = 1.0 x 10⁻³ M / 1.0 x 10⁻⁵ M = 100.0.

∴ The vinegar is highly acidic by 100 times than yogurt.